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                <h1 id="l-system-trees">L-system trees<a class="headerlink" href="#l-system-trees" title="Permanent link">&para;</a></h1>
<h2 id="tree-definition">Tree definition<a class="headerlink" href="#tree-definition" title="Permanent link">&para;</a></h2>
<div class="codehilite"><pre><span></span><code><span class="err">treedef={</span>
<span class="err">    axiom,         --string  initial tree axiom</span>
<span class="err">    rules_a,       --string  rules set A</span>
<span class="err">    rules_b,       --string  rules set B</span>
<span class="err">    rules_c,       --string  rules set C</span>
<span class="err">    rules_d,       --string  rules set D</span>
<span class="err">    trunk,         --string  trunk node name</span>
<span class="err">    leaves,        --string  leaves node name</span>
<span class="err">    leaves2,       --string  secondary leaves node name</span>
<span class="err">    leaves2_chance,--num     chance (0-100) to replace leaves with leaves2</span>
<span class="err">    angle,         --num     angle in deg</span>
<span class="err">    iterations,    --num     max # of iterations, usually 2 -5</span>
<span class="err">    random_level,  --num     factor to lower nr of iterations, usually 0 - 3</span>
<span class="err">    trunk_type,    --string  single/double/crossed) type of trunk: 1 node,</span>
<span class="err">                   --        2x2 nodes or 3x3 in cross shape</span>
<span class="err">    thin_branches, --boolean true -&gt; use thin (1 node) branches</span>
<span class="err">    fruit,         --string  fruit node name</span>
<span class="err">    fruit_chance,  --num     chance (0-100) to replace leaves with fruit node</span>
<span class="err">    seed,          --num     random seed, if no seed is provided, the engine</span>
<span class="err">                             will create one.</span>
<span class="err">}</span>
</code></pre></div>

<h2 id="key-for-special-l-system-symbols-used-in-axioms">Key for special L-System symbols used in axioms<a class="headerlink" href="#key-for-special-l-system-symbols-used-in-axioms" title="Permanent link">&para;</a></h2>
<ul>
<li><code>G</code>: move forward one unit with the pen up</li>
<li><code>F</code>: move forward one unit with the pen down drawing trunks and branches</li>
<li><code>f</code>: move forward one unit with the pen down drawing leaves (100% chance)</li>
<li><code>T</code>: move forward one unit with the pen down drawing trunks only</li>
<li><code>R</code>: move forward one unit with the pen down placing fruit</li>
<li><code>A</code>: replace with rules set A</li>
<li><code>B</code>: replace with rules set B</li>
<li><code>C</code>: replace with rules set C</li>
<li><code>D</code>: replace with rules set D</li>
<li><code>a</code>: replace with rules set A, chance 90%</li>
<li><code>b</code>: replace with rules set B, chance 80%</li>
<li><code>c</code>: replace with rules set C, chance 70%</li>
<li><code>d</code>: replace with rules set D, chance 60%</li>
<li><code>+</code>: yaw the turtle right by <code>angle</code> parameter</li>
<li><code>-</code>: yaw the turtle left by <code>angle</code> parameter</li>
<li><code>&amp;</code>: pitch the turtle down by <code>angle</code> parameter</li>
<li><code>^</code>: pitch the turtle up by <code>angle</code> parameter</li>
<li><code>/</code>: roll the turtle to the right by <code>angle</code> parameter</li>
<li><code>*</code>: roll the turtle to the left by <code>angle</code> parameter</li>
<li><code>[</code>: save in stack current state info</li>
<li><code>]</code>: recover from stack state info</li>
</ul>
<h2 id="example">Example<a class="headerlink" href="#example" title="Permanent link">&para;</a></h2>
<p>Spawn a small apple tree:</p>
<div class="codehilite"><pre><span></span><code><span class="err">pos = {x=230,y=20,z=4}</span>
<span class="err">apple_tree={</span>
<span class="err">    axiom=&quot;FFFFFAFFBF&quot;,</span>
<span class="err">    rules_a=&quot;[&amp;&amp;&amp;FFFFF&amp;&amp;FFFF][&amp;&amp;&amp;++++FFFFF&amp;&amp;FFFF][&amp;&amp;&amp;----FFFFF&amp;&amp;FFFF]&quot;,</span>
<span class="err">    rules_b=&quot;[&amp;&amp;&amp;++FFFFF&amp;&amp;FFFF][&amp;&amp;&amp;--FFFFF&amp;&amp;FFFF][&amp;&amp;&amp;------FFFFF&amp;&amp;FFFF]&quot;,</span>
<span class="err">    trunk=&quot;default:tree&quot;,</span>
<span class="err">    leaves=&quot;default:leaves&quot;,</span>
<span class="err">    angle=30,</span>
<span class="err">    iterations=2,</span>
<span class="err">    random_level=0,</span>
<span class="err">    trunk_type=&quot;single&quot;,</span>
<span class="err">    thin_branches=true,</span>
<span class="err">    fruit_chance=10,</span>
<span class="err">    fruit=&quot;default:apple&quot;</span>
<span class="err">}</span>
<span class="err">minetest.spawn_tree(pos,apple_tree)</span>
</code></pre></div>
              
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